interesting issue... just curious, what makes you think it's the regulator?
edit: read your post again, missed the part about not letting enough fuel etc etc...
still interested, did some research. here's what i read. it
might help you,i hope.
Typically located on or near your firewall and attached to your metal fuel line tubing, the fuel pressure regulator houses a spring operated valve that will open if it feels the excessive vacuum forces of too much fuel in the lines. It then allows the extra fuel to run into a reservoir where it will be safe and reduce the pressure in the lines. The fuel pressure regulator is responsible for keeping your fuel lines at a constant pressure rating while also preventing the use of too much fuel during acceleration, deceleration, and other emission heavy operations.
Because of its simple design and dependence on vacuum forces, the fuel pressure regulator does not frequently have problems. If a problem does occur within the regulator, it will involve the spring valve and may mean that it can't close because of a clog, a worn spring, or maybe a leak due to corrosion. Other closely related fuel pressure gauge problems would be a clog or leak in the lines attached that impeded the flow of fuel or vacuum pressure through the lines.
You will know there is a problem with your fuel pressure regulator from several noticeable symptoms. There will most likely be hesitation during acceleration, excessive load up during deceleration which may cause backfiring or emission odor, and you may even experience a choking sensation like the fuel or air is being completely cut off from the motor at times. Some vehicles may give you a warning light or trouble code to identify the problem.
Read more:
http://www.redlinemotive.com/replace...#ixzz2MLJ6Xbtl
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'95 4runner 4" of lift, 31" guard dogs, Rugged Ridge hubs, yakima roof rack/home built basket
still to come
addicted offroad bumper, winch, re-gear and some bigger tires, some fender trimming, one day i'll rebuild the suspension to a more flexible setup.
I NEED A REAR LOCKER!!!